Portion of an electronic mouse



FIG. 1 is a rear perspective view of a portion of an electronic mouse showing our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a top view thereof.

The broken line showing of the remainder of the electronic mouse is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of an electronic mouse, as shown and described. 